Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
The getCanGoBack() method of the HTMLIFrameElement interface is used to indicate whether it's possible to go back in the navigation history of the browser <iframe>.
Syntax
instanceOfHTMLIframeElement.getCanGoBack()
.then(function(result) { ... });
Returns
A Promise that resolves with a boolean that equals true if the history can be navigated backward or false if not.
Parameters
None.
Example
function canMoveBwd() {
browser.getCanGoBack().then(function(result) {
if (result) {
back.disabled = false;
console.log("It's possible to navigate
the history backward.");
} else {
back.disabled = true;
console.log("It's not possible to navigate
the history backward.");
}
});
}Specification
Not part of any specification.
Browser compatibility
Supported since Firefox 47, in chrome code only. Promise-based syntax only since Firefox 65.
Unlikely ever to be supported in other browsers.